SIEGEL: Today isn't just for Leaplings. Everyone can take part. As we heard in last week episode of the NBC sitcom, "30 Rock."

(SOUNDBITE OF SITCOM, "30 ROCK")

JACK MCBRAYER: (as Kenneth) Every four years, you get a magical extra day. A day to do the things you ordinarily wouldn't ordinarily do, to take chances. For instance, I am wearing a braided necklace with the shark's tooth on it.

KEITH POWELL: (as Toofer) I listen to rap music for the first time, not a fan.

JANE KRAKOWSKI: And you and I are going to a party thrown by a billionaire. Come on, take a leap - live.

CORNISH: (as Jenna) Perhaps a leap of faith.

(SOUNDBITE OF MUSIC, "HERE COMES THE BRIDE")

CORNISH: Way back when, women in Ireland, among many places, weren't allowed to propose marriage to a man, except on February 29th.

SIEGEL: It's believed that tradition started in fifth century Ireland, though it's been attributed to various historical figures. According to legend, Saint Brigid complained to Saint Patrick that women had to wait too long for their suitors to pop the question.

CORNISH: Saint Patrick's solution: women could take matters into their own hands on this one extra day in the year.

SIEGEL: But for those of you thinking about getting married today, in Greece: Brides beware. It is considered unlucky there. Transcript provided by NPR, Copyright NPR.